Signaling system



.l. C. FIELD.

SIGNALING SYSTEM.

APPLICATION FILED NOV. 26, 1911.

Patented Feb. 22,- 1921.

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operated signaling systems in which a pluralityof waystations connected with a single line circuit are each provided with a se Qlectively'operated signal controlling device.

Be it known that I, Josnrn citizen of the United States, residing at UNITED STATES PATENT OFFICE.

aosnrn c. FIELD, or ORANGE, NEW mnsnv assrenon 'ro WESTERN ELECTRIC 1 COMPANY, mcoarona'rnn, or NEW Yonm'n. A conronn'rron'or NEW YORK.

Toiall'who m concern: a

C. Finn), j a

Oran e, in'the county ofsEssexand State of New. ersey, have invented certain new and useful Improvements in Signaling Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to; signaling systems, and more particularly to selectively The object 'of' this invention in general I is to provide animproved organization of apparatus and circuits whereby any party on a circuit may, without assistance, call and communicate with any other partyon the same circuit without operating the signals at any of-the other waystations on the line.

In accordance with the general vfeatures of vices'of each bridge through the selectively operated device associated therewith and from a common source of energy. which is I :connected insimplex of the line through, a

high impedance retardation coil.

The drawing is a dia am of circuitsand apparatus illustrating t is invention.

. In the drawing 5 and'6 designate a pair of line Wires with which are associated waystations A and BngAt each of the 'way- 7 stations A and B is a selectively operated signal controlling device, which comprises in general a polarized operating magnet 7 a step-by-step 'elementy8 carrying a contact arm 9 and la stationary contact element 10.4: A centrally pivoted armature 11 isyadapted, to normal position under the actionlof a in response to, alternating current impulses through the magnet 7', to operate-a stepping pawl 12 to advance the step-by-step element Specification of Letters Patent."

smnnrme SYSTEM.

14: in thestep -by-step ,element S upon the cessation of the-last, impulse of the combination .of selecting impulses. When the 10, thereby closing a local circuit through the bell 15-which thereupon operates to furp atentedFeb.22,'1921. Application filed November 26,1917. Serial No. 203,950. Y 1

nish a signal to the attendant at the station. .Duringthe operationot the bell 15 the resistance 40is intermittently 'bridgeda across the line wires 5 and'6 in series with onewinding ofthebell. magnet and the condenser 41 totransmit an answer backsignal to the calling station toindicate to the opat the called station is operated. The conthe establishment of a direct, current bridge The selectively operated signal controlling device, illustratedinjthe drawing, is acode selector of the'ty e disclosed in my copenderator thereat (whose receiver 50 is also. bridged across the linewires) that the bell across the line.wires,'which might interfere with the proper operation of the selector.

ing application, eria1.No. 98,38 1, filed Maya;

.18, 1916, Patent No. 1,343,256 issued June 15, 1920. A detaileddescriptioniof the construction and operation of this selector will be ,foundw-in this copending application,

from which it will be seen that since the se-gw lector funct ons 1n response to a code or combination of impulses, the station contacts 9 and 10 of one station only, namely the cal-led station, are; clos'ed in response to' a given combination of impulses whereby only the;

bell at the desired station operates. After the operation of: the bell at the-called station, anotheriimpulse may: he sent ,over the line to cause the elementS tO. advance one step, moving thepin 14 out of engagement with the spring-13, whereupon upon the ces sation of the impulse :the element 8- returns coiled spring 42, one end of which isse- 'curedito the shaft upon which the element,

8 is mountedand the other end of which is held infixed position.

bridge comprising two impedance coils 20 and 21, and two condensers 22 and 23, the impedance coils and condensers of each bridge being included in serial relation with respect to each other. One side of each, of the magnets 7 is connected with ground, the other being connected with the". inductive bridge at a point between the condensers 22 and 23. A battery 25 located atone end of the line wires 5 and 6 is connected in simplex of the line wires through high-impede ance, low-resistance retardation coils 27 27 and the windings 28,128 of ai'simplexicoil.

Located at each of the waystations is a key lever 30 'connected between the condenser 23 and linewire 6,"and'co6perating with two contacts 31 and 82. Contact 31 connected with ground is adapted to be opened and closed intermittently durmg the operation of the key in calling,wh1lecontact -82 connected between condenser22 and line wire 5 is adapted'to be continuously closed during the operation of the key lever 30.

The operation in this system is as follows:

Normally the condensers 22 and 23 are 1 charged to the potential ofthe battery 25. lVhen the calling key at any StatlOIl- 1s operated, the contact 32 will be closed and recausing a flow of current impulses through the windings ,of the magnets 7 alternately in opposite direction to advance the associated step-by-step elements 8 until the station contacts of a desired station are closed. The retardation coils 20 and 21 are of sufiicient impedance to talking currents so that there will be no appreciable transmission loss due to this bridge at each station. The line wiresbeing in multiple in the operation of the selectors, a much longer line with a greater number of stations can be operated with a given battery than would be possible in an ordinary bridged system.

What is claimed is: 1; In a signaling system, a metallic line circuit, aplurality of waystations associated devices.

therewith, a selectively operatedpolarized signal controlling device at each waystation connected between the opposite sides of the metallic circuitand ground, a signaling device at each waystation, asource of direct current supply having one pole grounded and 'its opposite pole connected 'to the two sides of the line'-circuit,circuit interrupting means at each waystation, and means at each waystat1on responsive to the operation of the circuit-interrupting means at any l devices.

2. In a signaling system, a metallic line circuit, a plurality of waystations associated therewith, a polarized signaling device at each of said waystati'ons connected between opposite sides of said metallic circuit and ground, a source of direct current supply having one pole grounded and its opposite pole connected to the two sides of the" line circuit, circuit-interrupting means at each of said waystations, and means at each of said waystations responsive to the operation of the circuit-interrupting means at any waystation for causing aflow of alternating current impulses through theipolari'zed signaling devices.

3. Infa signaling system, a; metallic line circuit, a plurality of waystations associated therewith, an inductive bridge connected with the metallic circuit at each of said waystations, a polarized signaling device:

at each of said waystations connected between the middle point of said inductive bridge and ground, 'a source of current connected between the two sides of theline circuit andground, and a circuit-interrupting device at each of said -waystations, each adapted inlts operation to charge and d1scharge the inductive devices at all of the waystations through their associated polari zed signaling devices to' actuate them.

4. In a signaling system, a metallic line circuit,a plurality of waystations associated therewith, a pair of condensers connected in bridge ofthe line circuitat each .of-said waystations, a polarized signaling device; at

each of said waystations connected to a point between said condensers and ground, a source'of'current having one pole connected to opposite sides of said line circuit and its other pole connected with ground, and a" circuit-interrupting device at each ofsaid waystatlons, each adapted 1n its operation to alternately charge the condensers at the several waystations through the 'a ssociated'signallng device in: one dlrectlon and discharge the condensers therethrough in-the opposite direction thereby to operatethe signaling 5. In a signaling system, a metallic line circuit, a'plurality of waystations associated therewith, a selectively operated polarized signallng device at each waystation connected between opposite: sides" of the 1 metallic circult and ground, a source of direct current supply having one pole grounded and its opposite pole connected to the two sides ing device thereby rendering the signaling of the line circuit, circuit-interrupting device selectively responsive for signaling means at each waystation, and means at each purposes. I Waystation responsive to the operation of In Witness whereof I hereunto subscribe 5 the circuit controlling means at any Waystamy name this 22nd day of November, A, D.

tion for causing a flow of alternating cur- 1917. rent impulses through the associated slgnal- JOSEPH C. FIELD. 

